Since December 9, Guardians of Peace have been causing mayhem by flashing up spooky messages on Sony computers and releasing thousands of documents, including sensitive employee data and email archives from Sony Pictures executives.

Today's leak could be the biggest one yet: It's the email archive of the CEO of Sony Pictures, Michael Lynton.

But the Sony hackers claim to have a vast amount of unreleased data. In fact, if the hackers are to be believed, we've barely scratched the surface of the Sony documents.

So far it's estimated that the Sony hackers have released around 235 Gigabytes of data. If their claims are to be believed, there's still a lot to come.

The hackers' public statements are also hinting that there are vast amounts of data yet to be released. A message accompanying today's document dump refers to it as "the beginning" and "The 1st day of Christmas."